* {
  border: 0;
  margin: 0;
}

#notes-table {
  display: table;
  overflow: hidden;
  background-size: 200px 200px;
}

#notes-table-cell {
  color: white;
  font-weight: bold;
  font-family: sans-serif;
  text-align: center;
  background-color: rgba(128, 128, 128, 0.5);
  display: table-cell;
  vertical-align: middle;
}

#tooltip {
  width: 150px;
  background-color: rgba(128, 128, 128, 0.7);
  color: white;
  font-size: 12px;
  position: absolute;
  border-radius: 5px;
}

.node circle {
  fill: #fff;
  /*stroke: steelblue;*/
  stroke-width: 1.5px;
}

.center-node {
  width: 200px;
  height: 200px;
  left: 380px;  /* (480 - 200 / 2) */
  top: 380px;
  position: absolute;
  z-index: 1;
}

.node {
  font: 10px sans-serif;
}

.node text {
  width: 50px;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 1.5px;
}




